Adam Gully (right), Math REU student and NSF VIGRE Graduate Fellow in Mathematics, sets up a transect to make electrical resistance measurements for surface impedance tomography. The reconstructed profiles are correlated with thickness soundings from electromagnetic induction experiments conducted by Kazu Tateyama (left), a research scientist at the Kitami Institute of Technology in Hokkaido, Japan. Photo taken by Ken Golden during the Sea Ice Physics and Ecosystem eXperiment (SIPEX), September 2007.